Muscle fine structure may maintain the function of oxidative fibres in haemoglobinless Antarctic fishes
K. M. O'Brien1,*,
C. Skilbeck2,
B. D. Sidell1 and
S. Egginton2,
1 School of Marine Sciences, University of Maine, Orono, ME 04469,
USA
2 Department of Physiology, University of Birmingham, B15 2TT, UK
* Present address: Department of Molecular, Cellular and Developmental Biology,
University of Colorado at Boulder, Boulder, CO 80309, USA

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Fig. 1. Semi-thin sections from (A) G. gibberifrons and (B) C.
rastrospinosus pectoral adductor muscle, illustrating the striking
difference in fibre cross-sectional area between nototheniids and
channichthyids. Scale bars, 100 µm.
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Fig. 2. Ultra-thin sections from (A) G. gibberifrons and (B) C.
rastrospinosus pectoral adductor muscle, illustrating the differences in
mitochondrial packing between nototheniids and channichthyids. m,
mitochondria; f, myofibrils. Scale bars, 5 µm.
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Fig. 3. Ultra-thin sections from (A) G. gibberifrons and (B) C.
rastrospinosus pectoral adductor muscle, showing the greater
mitochondrial cristae density in nototheniids than channichthyids. Scale bars,
2 µm.
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Fig. 4. Calculated ultrastructural and capillary dimensions per cm3
mitochondria of pectoral adductor muscle from Antarctic fishes. N.c.,
Notothenia coriiceps; G.g., Gobionotothen gibberifrons; C.a., Chaenocephalus
aceratus; C.r., Chionodraco rastrospinosus. Data for G.
gibberifrons are taken from the present paper and Londraville and Sidell
(1990a ).
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© The Company of Biologists Ltd 2003